The Football Association are to investigate after a series of ugly incidents at last night's Premier League Under 21 clash between Liverpool and Manchester United.

Young Liverpool striker Adam Morgan was confronted by a pitch invader late in the second half of the match at Langtree Park, the home of St Helens rugby league club.

There were also two instances of flares being set off in the stands, with one being thrown onto the pitch, during United's 1-0 victory.

Raucous: Manchester United fans brought smoke bombs and a flare to the U21 match at Langtree Park

Interruption: A Manchester United supporter runs on to the pitch to confront Liverpool's Adam Morgan

Morgan, 18, later tweeted: 'What a idiot he was - just gives them a bad name.'

There were also reports of distasteful chants being made by a section of the visiting support but Merseyside Police said no complaints had been made to them and there was no record of any incidents in which they were involved at the fixture.

United claimed a dramatic win over their bitter rivals team thanks to Michele
Fornasier's last-gasp strike.

The Italian defender pounced from close range just as it seemed Warren Joyce's side would be denied victory in front of a large crowd.

Alex Buttner and Nick Powell started for United, along with Jeffery Schlupp who is on trial from Leicester, while Raheem Sterling, Suso, Andre Wisdom and Jonjo Shelvey lined up for Liverpool in the Barclays Premier League Under 21 clash.

Liverpool had Stephen Sama sent off early in the second half for his second yellow card.

But the visitors almost failed to capitalise on the dismissal of Sama, spurning several good chances to score before Fornasier's late strike.